## C.2. What You Can Download

http://www.research.att.com/sw/download is the starting point for actually downloading the ksh software. The software is covered by an Open Source-style license. The current version of the license is at http://www.research.att.com/sw/license/ast-open.html. This license is reproduced in Appendix D. You should read and understand it first; if its terms aren't acceptable to you, you should not download the software source code or binaries from the AT&T web site.

The software on the AT&T web site is available in different "packages," most of which have names prefixed with "ast," which stands for "Advanced Software Tools." The source packages come as gziped tar files, using the .tgz file name suffix. Choose one or more of the following packages to download:

ratz
  A standalone executable program for reading gziped tar files. Use this if you don't have gzip on your system and don't want to go to the trouble to first download and build gzip. You may download source code for this package or a binary executable for any of the architectures listed in Table C-1.
ksh
  This is the fastest way to get a ksh93 executable. Versions are available for the architectures listed in Table C-1.
INIT
  This package must be downloaded when building any of the following source packages. It contains the files and directory structures that the AST tools and build system rely upon.
ast-ksh
  This package builds just the support infrastructure (libraries, environment test programs, etc.) for ksh and the ksh executable. It is the simplest thing to build.
ast-base
  This package builds everything in the ast-ksh package and a few additional basic AST tools. In particular, it includes pax, an archiving tool that combines features from tar(1) and cpio(1), and nmake, a significantly enhanced version of the standard Unix make(1) program. It also includes the sfio (Safe Fast I/O) and ast libraries, which you can use for your own programs.
ast-open
  This package builds everything in the ast-base package and many additional tools. Note particularly that tksh (see Appendix A) is included in this package.

Each of the packages (except INIT) is also available as prebuilt binaries. Table C-1 lists the available architectures for these packages. Locale translations for some locales for some of the programs are also available.

#### Table C-1. Supported architectures for AST programs

Name | OS/Architecture
--- | ---
`darwin.ppc` | Apple's MacOS X (a.k.a. Darwin) for the Motorola Power PC
`hp.pa` | Hewlett-Packard HP-UX for HP Precision Architecture
`ibm.risc` | IBM's AIX for RS/6000
`linux.i386` | GNU/Linux on Intel 80386 and higher
`linux.s390` | GNU/Linux on the IBM S/390 mainframe
`mvs.390` | IBM's MVS on the IBM S/390 mainframe
`netbsd.i386` | NetBSD on Intel 80386 and higher (see http://www.netbsd.org)
`openbsd.i386` | OpenBSD on Intel 80386 and higher (see http://www.openbsd.org)
`osf.alpha` | OSF/1 on the Compaq (nee Digital) Alpha processor
`sgi.mips3` | Silicon Graphics (SGI) Irix on the MIPS processor
`sol.sun4` | Solaris 5.4 on the Sun SPARC architecture
`sol6.sun4` | Solaris 5.6 on the Sun SPARC architecture
`sol7.i386` | Solaris 7 on Intel 80386 and higher
`sol7.sun4` | Solaris 7 on the Sun SPARC architecture
`sol8.sun4` | Solaris 8 on the Sun SPARC architecture
`sun4` | SunOS 4.x on the Sun SPARC architecture
`unixware.i386` | UnixWare (the latest official version of System V) on Intel 80386 and higher

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